一维Langmuir Turbulence中的扩散辐射
Diffusive Radiation in One-dimensional Langmuir Turbulence
摘要：
我们计算了在一维朗缪尔湍流的存在下，由相对论粒子产生的辐射谱，该湍流可能是由等离子体中的流动不稳定性产生的，特别是在激波阵面或激波-激波相互作用中。辐射光谱的形状敏感地依赖于粒子速度和电场方向之间的角度。在粒子的横向运动的情况下，辐射谱是简并的，类似于空间均匀的朗缪尔振荡。在斜传播的情况下，频谱更复杂，它由许多幂律区域组成，并且可能包含明显的高频频谱峰。%（$ω=2ω\pe γ^2$）。所考虑的发射过程与各种实验室等离子体设置和天体物理物体（如伽马射线暴和准直喷流）有关。
英文摘要：
We calculate spectra of radiation produced by a relativistic particle in the presence of one-dimensional Langmuir turbulence which might be generated by a streaming instability in the plasma, in particular, in the shock front or at the shock-shock interactions. The shape of the radiation spectra is shown to depend sensitively on the angle between the particle velocity and electric field direction. The radiation spectrum in the case of exactly transverse particle motion is degenerate and similar to that of spatially uniform Langmuir oscillations. In case of oblique propagation, the spectrum is more complex, it consists of a number of power-law regions and may contain a distinct high-frequency spectral peak. %at $ω=2ω\pe γ^2$. The emission process considered is relevant to various laboratory plasma settings and for astrophysical objects as gamma-ray bursts and collimated jets.
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